export fewer things from module targets (#8089)

Closes https://github.com/shader-slang/slang/issues/7722 without adding
SONAME

```
e@light-hope in ~/work/slang on HEAD (68b0125) [nix-shell] [direnv]
$ nm -DC --defined-only build/Debug/lib/libslang-llvm.so
0000000001a4b637 T createLLVMDownstreamCompiler_V4
0000000001a427ed T createLLVMFileCheck_V1
0000000001a4b91e W std::type_info::operator==(std::type_info const&) const
0000000001a4bb07 W std::_Sp_make_shared_tag::_S_ti()
0000000001059165 u std::ranges::_Cpo::iter_move
0000000005f92ac0 V typeinfo for std::_Sp_make_shared_tag
0000000005f92938 V vtable for std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>

e@light-hope in ~/work/slang on HEAD (68b0125) [nix-shell] [direnv]
$ nm -DC --defined-only build/Debug/lib/libslang-glslang.so
00000000004701a2 T glslang_compile
000000000047012b T glslang_compile_1_1
000000000046ffd9 T glslang_compile_1_2
000000000046db75 T glslang_disassembleSPIRV
000000000046da42 T glslang_disassembleSPIRVWithResult
000000000047028b T glslang_linkSPIRV
000000000046d8fa T glslang_validateSPIRV

e@light-hope in ~/work/slang on HEAD (68b0125) [nix-shell] [direnv]
$ nm -DC --defined-only build/Debug/lib/libslang-glsl-module.so
0000000000135bf9 T slang_getEmbeddedModule
```

I think that the exports from libslang-llvm are unavoidable I believe,
however these are weak exports so should exhibit the same problem.

@NBickford-NV does this look good for you?

0 files changed, 0 insertions, 0 deletions